What Are the Warning Signs of a Hidden Water Leak?

The most reliable warning signs

• Higher water bill with no change in usage.
• Running-water sound when all fixtures are off.
• Musty smell, mold, or mildew, especially in one area.
• Stains, bubbling paint, or sagging on walls/ceilings.
• Warm spots on the floor — a sign of a hot-water slab leak.
• Low water pressure across the home.

How do I confirm a leak with the meter test?

Turn off every water fixture and appliance. Find your water meter and note the reading (or watch the leak indicator dial). Wait 1–2 hours without using water and check again. If the reading moved, you likely have a leak somewhere in the system.

Why hidden leaks are worth catching early

A small hidden leak can waste thousands of gallons a year and quietly cause rot, mold, and foundation damage—far more expensive than the repair itself. Early detection is almost always the cheaper path. Leaks around the water heater deserve special attention—see why a water heater runs out of hot water for what tank symptoms mean.

When should I call a professional?

Call a plumber if the meter test shows movement, you see water damage, or you can't locate the source. Professional leak detection uses acoustic and thermal tools to pinpoint leaks inside walls or under slabs without tearing up the house.

Suspect a hidden leak? Schedule leak detection or call (660) 827-0101.